To view the wrapper generated by Flex Builder, run the current project. Flex Builder generates an HTML page in the same directory as the project's root MXML file. This directory also includes the supporting files such as the history.css, history.js, historyFrame.html, and AC_OETags.js files.
You can configure the wrapper by using the Flex Compiler properties dialog box in Flex Builder. Configuration settings include:
For more information, see the Flex Builder documentation.